US2268361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Fedders Manufacturing Co Inc
•
Filing: 1941-08-11
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Granted: 1941-12-30
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Expires: 1961-08-11
Abstract
No abstract record available.
Inventors
- 👤 Edmund R Walker
- 👤 Sidney A Whitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
F; F28; F28F; F28F27/00; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; F28F13/00; F28F13/14; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-12-29 | 1945-06-30 | 1945-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-12-29 | 1949-06-30 | 1949-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-12-29 | 1953-06-30 | 1953-12-30 | $7700.00 | Window Closed / Lapsed |